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The archaeal ATP synthase is a multisubunit complex that consists of a catalytic A(1) part and a transmembrane, ion translocation domain A(0). The A(1)A(0) complex from the hyperthermophile Pyrococcus furiosus was isolated. Mass analysis of the complex by laser-induced liquid bead ion desorption (LILBID) indicated a size of 730 +/- 10 kDa. A three-dimensional map was generated by electron microscopy from negatively stained images. The map at a resolution of 2.3 nm shows the A(1) and A(0) domain, connected by a central stalk and two peripheral stalks, one of which is connected to A(0), and both connected to A(1) via prominent knobs. X-ray structures of subunits from related proteins were fitted to the map. On the basis of the fitting and the LILBID analysis, a structural model is presented with the stoichiometry A(3)B(3)CDE(2)FH(2)ac(10).
Medical students are exposed to infectious diseases during the course of their clinical training. Unfortunately, vaccination rates among medical students remain insufficient. However, immunizations against vaccine-preventable diseases should be carried out before the students enter clinical courses. This is vital in order to prevent nosocomial infections. We screened 366 medical students in their first clinical year for hospital-related viral diseases. Serum samples were collected between April and May 2007. Antibody testing was carried out using commercial ELISA systems against measles, mumps, rubella, varicella, hepatitis B (HBV), hepatitis C (HCV), and human immunodeficiency virus (HIV). Overall, 63.9% (n=234) of the students were sufficiently vaccinated against HBV. In contrast, 31.7% (n=116) had not received any HBV vaccine dosage, and 4.4% (n=16) had not completed the full vaccine cycle (<3 dosage). Remarkably, two students showed serological markers of resolved HBV infection. In addition, one student was HCV-positive and one was HIV-positive, respectively. The following seronegative rates were found: measles (7.9%), mumps (17.5%), rubella (6.5%), and varicella (2.2%). Further work is needed to identify optimal strategies for improving vaccination rates among medical students. It is imperative to identify and limit possible disparities in immunity of vaccine-preventable diseases before initial patient contact. With regard to the primary diagnosis of serious virus diseases including HBV, HCV and HIV, medical students should be screened for these blood borne pathogens.
Medizinstudenten sind im Rahmen ihrer klinischen Ausbildung einer erhöhten Infektionsgefährdung ausgesetzt. Dessen ungeachtet sind die Impfraten der Medizinstudenten ungenügend. Ein adäquater Impfstatus der Medizinstudenten vor Beginn ihres klinischen Ausbildungsabschnitts ist jedoch wichtig, um nosokomiale Infektionen zu vermeiden.
Im April und Mai 2007 wurden insgesamt 366 Serumproben von Medizinstudenten des ersten klinischen Semesters ausgewertet. Die serologischen Untersuchungen erfolgten mittels etablierter ELISA-Systeme. Untersucht wurde auf spezifische Antikörper gegen Masern, Mumps, Röteln, Varizellen, Hepatitis B (HBV), Hepatitis C (HCV) und HIV.
Insgesamt 63,9% (n=234) der Studenten waren gegen Hepatitis B geimpft (Grundimmunisierung, drei Impfdosen). Dagegen hatten 31,7% (n=116) der Studenten bisher noch keine Hepatitis B-Impfung und 4,4% (n=16) kein komplettes Impfschema erhalten (<drei Impfungen). Zwei Studenten zeigten serologische Marker einer abgelaufenen HBV-Infektion. Es wurde die Erstdiagnose einer HCV-Infektion sowie die Erstdiagnose einer HIV-Infektion gestellt. Bei 7,9% (Masern), 17,5% (Mumps), 6,5% (Röteln) und 2,2% (Varizellen) der Studenten konnten keine virusspezifischen Antikörper nachgewiesen werden.
Es sollten weitere Anstrengungen unternommen werden, um die Impfraten der Medizinstudenten zu verbessern. Es ist wichtig, Immunitätslücken zu identifizieren und vor dem ersten Patientenkontakt zu schließen. Im Hinblick auf die Erstdiagnose und die Folgen schwerwiegender blutübertragbarer Erkrankungen (z.B. HBV, HCV und HIV) sollten Medizinstudenten auf diese Infektionen untersucht werden.
The single nucleotide polymorphism 118A>G of the human micro-opioid receptor gene OPRM1, which leads to an exchange of the amino acid asparagine (N) to aspartic acid (D) at position 40 of the extracellular receptor region, alters the in vivo effects of opioids to different degrees in pain-processing brain regions. The most pronounced N40D effects were found in brain regions involved in the sensory processing of pain intensity. Using the mu-opioid receptor-specific agonist DAMGO, we analyzed the micro-opioid receptor signaling, expression, and binding affinity in human brain tissue sampled postmortem from the secondary somatosensory area (SII) and from the ventral posterior part of the lateral thalamus, two regions involved in the sensory processing and transmission of nociceptive information. We show that the main effect of the N40D micro-opioid receptor variant is a reduction of the agonist-induced receptor signaling efficacy. In the SII region of homo- and heterozygous carriers of the variant 118G allele (n=18), DAMGO was only 62% as efficient (p=0.002) as in homozygous carriers of the wild-type 118A allele (n=15). In contrast, the number of [3H]DAMGO binding sites was unaffected. Hence, the micro-opioid receptor G-protein coupling efficacy in SII of carriers of the 118G variant was only 58% as efficient as in homozygous carriers of the 118A allele (p<0.001). The thalamus was unaffected by the OPRM1 118A>G SNP. In conclusion, we provide a molecular basis for the reduced clinical effects of opioid analgesics in carriers of mu-opioid receptor variant N40D.
In plants, a family of more than 20 heat stress transcription factors (Hsf) controls the expression of heat stress (hs) genes. There is increasing evidence for the functional diversification between individual members of the Hsf family fulfilling distinct roles in response to various environmental stress conditions and developmental signals. In response to hs, accumulation of both heat stress proteins (Hsp) and Hsfs is induced. In tomato, the physical interaction between the constitutively expressed HsfA1 and the hs-inducible HsfA2 results in synergistic transcriptional activation (superactivation) of hs gene expression. Here, we show that the interaction is strikingly specific and not observed with other class A Hsfs. Hetero-oligomerization of the two-component Hsfs is preferred to homo-oligomerization, and each Hsf in the HsfA1/HsfA2 hetero-oligomeric complex has its characteristic contribution to its function as superactivator. Distinct regions of the oligomerization domain are responsible for specific homo- and hetero-oligomeric interactions leading to the formation of hexameric complexes. The results are summarized in a model of assembly and function of HsfA1/A2 superactivator complexes in hs gene regulation.
The cell division cycle protein 37 (Cdc37) and the 90-kDa heat shock protein (Hsp90) are molecular chaperones, which are crucial elements in the protein signaling pathway. The largest class of client proteins for Cdc37 and Hsp90 are protein kinases. The catalytic domains of these kinases are stabilized by Cdc37, and their proper folding and functioning is dependent on Hsp90. Here, we present the x-ray crystal structure of the 16-kDa middle domain of human Cdc37 at 1.88 angstroms resolution and the structure of this domain in complex with the 23-kDa N-terminal domain of human Hsp90 based on heteronuclear solution state NMR data and docking. Our results demonstrate that the middle domain of Cdc37 exists as a monomer. NMR and mutagenesis experiments reveal Leu-205 in Cdc37 as a key residue enabling complex formation. These findings can be very useful in the development of small molecule inhibitors against cancer.
An efficient route for delivering specific proteins and peptides into neurons could greatly accelerate the development of therapies for various diseases, especially those involving intracellular defects such as Parkinson disease. Here we report the novel use of polybutylcyanoacrylate nanoparticles for delivery of intact, functional proteins into neurons and neuronal cell lines. Uptake of these particles is primarily dependent on endocytosis via the low density lipoprotein receptor. The nanoparticles are rapidly turned over and display minimal toxicity to cultured neurons. Delivery of three different functional cargo proteins is demonstrated. When primary neuronal cultures are treated with recombinant Escherichia coli beta-galactosidase as nanoparticle cargo, persistent enzyme activity is measured beyond the period of nanoparticle degradation. Delivery of the small GTPase rhoG induces neurite outgrowth and differentiation in PC12 cells. Finally, a monoclonal antibody directed against synuclein is capable of interacting with endogenous alpha-synuclein in cultured neurons following delivery via nanoparticles. Polybutylcyanoacrylate nanoparticles are thus useful for intracellular protein delivery in vitro and have potential as carriers of therapeutic proteins for treatment of neuronal disorders in vivo.
Inhibition of the soluble epoxide hydrolase (sEH) has beneficial effects on vascular inflammation and hypertension indicating that the enzyme may be a promising target for drug development. As the enzymatic core of the hydrolase domain of the human sEH contains two tyrosine residues (Tyr383 and Tyr466) that are theoretically crucial for enzymatic activity, we addressed the hypothesis that the activity of the sEH may be affected by nitrosative stress. Epoxide hydrolase activity was detected in human and murine endothelial cells as well in HEK293 cells and could be inhibited by either authentic peroxynitrite (ONOO−) or the ONOO− generator 3-morpholino-sydnonimine (SIN-1). Protection of the enzymatic core with 1-adamantyl-3-cyclohexylurea in vitro decreased sensitivity to SIN-1. Both ONOO− and SIN-1 elicited the tyrosine nitration of the sEH protein and mass spectrometry analysis of tryptic fragments revealed nitration on several tyrosine residues including Tyr383 and Tyr466. Mutation of the latter residues to phenylalanine was sufficient to abrogate epoxide hydrolase activity. In vivo, streptozotocin-induced diabetes resulted in the tyrosine nitration of the sEH in murine lungs and a significant decrease in its activity. Taken together, these data indicate that the activity of the sEH can be regulated by the tyrosine nitration of the protein. Moreover, nitrosative stress would be expected to potentiate the physiological actions of arachidonic acid epoxides by preventing their metabolism to the corresponding diols.
The transporter associated with antigen processing (TAP) is an essential machine of the adaptive immune system that translocates antigenic peptides from the cytosol into the endoplasmic reticulum lumen for loading of major histocompatibility class I molecules. To examine this ABC transport complex in mechanistic detail, we have established, after extensive screening and optimization, the solubilization, purification, and reconstitution for TAP to preserve its function in each step. This allowed us to determine the substrate-binding stoichiometry of the TAP complex by fluorescence cross-correlation spectroscopy. In addition, the TAP complex shows strict coupling between peptide binding and ATP hydrolysis, revealing no basal ATPase activity in the absence of peptides. These results represent an optimal starting point for detailed mechanistic studies of the transport cycle of TAP by single molecule experiments to analyze single steps of peptide translocation and the stoichiometry between peptide transport and ATP hydrolysis.
Cyclic AMP analogs containing hydrophobic modification of C(8) at the adenine ring such as 8-(4-chlorophenylthio)-cAMP (8-pCPT-cAMP) and 8-(4-chlorophenylthio)-2'-O-methyl-cAMP (8-pCPT-2'-O-methyl-cAMP) can penetrate membranes due to their high lipophilicity and directly activate intracellular cAMP effectors. Therefore, these cAMP analogs have been used in numerous studies, assuming that their effects reflect the consequences of direct activation of cAMP effectors. The present study provides evidence that 8-pCPT-modified cAMP analogs and their corresponding putative hydrolysis products (8-(4-chlorophenylthio)-adenosine (8-pCPT-ado) and 8-(4-chlorophenylthio)-2'-O-methyl-adenosine (8-pCPT-2'-O-methyl-ado)) inhibit the equilibrative nucleoside transporter 1 (ENT1). In PC12 cells, in which nucleoside transport strongly depended on ENT1, 8-pCPT-ado, 8-pCPT-2'-O-methyl-ado, and, to a smaller extent, 8-pCPT-2'-O-methyl-cAMP caused an increase of protein kinase A substrate motif phosphorylation and anti-apoptotic effect by an A(2A) adenosine receptor (A(2A)R)-dependent mechanism. In contrast, the effects of 8-pCPT-cAMP were mainly A(2A)R-independent. In HEK 293 showing little endogenous ENT1-dependent nucleoside transport, transfection of ENT1 conferred A(2A)R-dependent increase in protein kinase A substrate motif phosphorylation. Together, the data of the present study indicate that inhibition of ENT1 and activation of adenosine receptors have to be considered when interpreting the effects of 8-pCPT-substituted cAMP/adenosine analogs.